"However, the distance between the Earth and Moon varies from 356,410 km (222,756
miles) at perigee, or closest approach to 406,697 km (254,186 miles)
at aposee, its farthest point".

712,820 km to 813,394 km

The moon is really just a large piece of rock, which was caught in the Earth's
gravitational field. Because the moon has a smaller mass than the Earth, 7.35 × 1022 kg compared to 5.98 × 1024 kg, the moon orbits
around the Earth, making the moon Earth's satellite. In fact, the moon is the
Earth 's one and only natural satellite.

So how was the diameter of the moon's orbit determined? One possible way would
be finding the Earth-Moon distance. To find the Earth-Moon distance, scientists
could use a RADAR laser, in which they can fire electromagnetic waves or em
waves at the moon and time how long it takes for the em waves to travel to the
moon and back. Since em waves always travel at the speed of light (3 × 108 m/s), and the time can be measured, one can use the equation v = s/t or s = vt, but don't forget to divide the measured time or the calculated distance by
2, as the em waves traveled twice the distance. The moon's distance from the
Earth varies from 360,000 km to 406,000 km, making the mean distance from the
Earth 384,000 km. Since its mean distance from the Earth is 384,000 km, the
average length of the moon's orbit's diameter is 768,000 km.

Is the moon really moving farther away from the Earth? Yes, it is. The moon
is moving about 3.8 cm farther away from the Earth every year. This occurs because
of tidal interactions. The moon's gravitational force pulls on the Earth making
it bulge ar the face of the Earth the moon is facing. These are called "tidal
bulges". The tidal bulges would affect the force of gravity on the moon,
as the bulge would have a greater gravitational pull on the moon than the center
of the Earth. And since the Earth rotates faster than the moon orbits, the tidal
bulges would move ahead of the moon and pull the moon towards the tidal bulge
causing the moon to speed up and move ahead in its orbit. Note: The moon is
only moved very little by this in a day, so don't get crazy.